<link href="https://cdn.bootcss.com/twitter-bootstrap/4.4.1/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
<div style="width: 100%;height: 50%;display: flex;align-items: center;justify-content: center;flex-direction: column;">
    <button class="btn btn-success" onclick="$('p').toggle('slow')">Toogle Hide</button>
</div>
<div style="width: 100%;height: 50%;display: flex;align-items: center;justify-content: center;">
    <p>Nice to see ya!</p>
</div>